On 26/05/17 12:51, Alexander Monakov wrote: > Note that the behavior with regards to __sync builtins (as opposed to __atomic) > remains unchanged, so uses of __sync_val_compare_and_swap can emit cmpxchg16 if > -mcx16 is given on the command line. Just as a note to any future readers, although I may well be wrong, I think this is only true for GCC 4.8.0 onwards, with the introduction of the 128 bit types. Prior to that, the only option is inline assembly.
